JP5219979B2 - Power system stabilization device and power system stabilization method - Google Patents

Description

  The present invention relates to a power system stabilizing device and a power system stabilizing method.

  When a line breakage accident or the like occurs in the transmission line between the upstream side and the downstream side of the tidal current in the power system, the power flow of the transmission line in which the accident does not occur and the impedance of the power system rapidly increase. If left unattended, the phase difference angle of the generator between the upstream side and the downstream side of the power system may expand, resulting in a step-out condition, resulting in a large-scale power outage for the downstream load. There is.

  Therefore, for example, immediately after the occurrence of an accident, the generator is disconnected from the power system (referred to as “electric control”) or the load is disconnected (referred to as “negative control”). That is, there is known a power system stabilizing device that avoids a step-out state of a generator) (see, for example, Patent Document 1).

  In addition, for example, by performing the above-described electric control and negative control, and simultaneously opening and closing a phase adjuster such as a power capacitor or shunt reactor installed in a substation in the power system, 2. Description of the Related Art An electric power system stabilizing device that achieves a reduction is known (see, for example, Patent Document 2).

JP-A-61-46123 JP 2001-352678 A

  By the way, the above-described electric control results in a decrease in the amount of power supplied, and the negative control described above results in a power failure in the area corresponding to the load. That is, when the “control amount” such as the electric control amount or the negative control amount increases, there arises a problem that the supply amount of power decreases or a power failure occurs.

  This invention is made | formed in view of this subject, The place made into the objective is to suppress the fluctuation | variation of the electric power system, suppressing the controlled variable of an electric power system.

  The invention for solving the above-mentioned problems is a detection device that detects an accident of a transmission line disposed between an upstream side and a downstream side of an electric power system, and acquisition that acquires system information indicating a state of the electric power system A device, a phase shifter that is disposed on a bus such as a plurality of substations connected to the power transmission line and controls reactive power supplied to the bus, and the detection device detects an accident on the power transmission line Control for opening / closing the phase adjuster so that the phase difference angle of the generator between the upstream side and the downstream side of the power system is within a predetermined range based on the system information acquired by the acquisition device And a power system stabilizing device.

  According to this power system stabilizing device, when a transmission line accident occurs, the voltage of the corresponding power line is increased or decreased through the opening / closing control of the phase shifter according to the state of the power system indicated by the system information. The phase difference angle of the generator between the upstream side and the downstream side is converged within a predetermined range to suppress the oscillation of the electric power system, so that not only the first wave step-out but also the subsequent step-out can be prevented. That is, the fluctuation of the electric power system is suppressed while the control quantities such as the electric control amount and the negative control amount of the electric power system are suppressed.

In the power system stabilizing device, the system information includes information for performing transient stability calculation before the transmission line accident is detected, and the power system when the transmission line accident is detected. It is preferable that the information is information for determining whether the phase difference angle of the generator between the upstream side and the downstream side of the generator is enlarged or reduced, or information indicating the power flow.
According to this power system stabilizing device, for example, the voltage of the bus can be increased or decreased in accordance with the phase difference angle of the generator representing the fluctuation of the power system or the time change of the tidal current. It is possible to effectively suppress the fluctuation of the power system while suppressing the control amount such as the amount.

Further, in the power system stabilizing device, the control device, based on the system information, controls the opening / closing of the phase adjuster so that the voltage of the bus line is increased when the phase difference angle is increased, and the phase difference When the angle is reduced, the phase adjuster is preferably controlled to be opened and closed so that the voltage of the bus bar decreases.
In general, according to the power phase difference angle curve, if the voltage of the bus rises when the phase difference angle of the generator increases, the maximum value of the phase difference angle that can be taken when this phase difference angle shifts from expansion to reduction decreases. If the voltage of the bus is lowered when the phase difference angle decreases, the minimum value of the phase difference angle that can be taken when the phase difference angle shifts from reduction to enlargement increases. Therefore, according to this power system stabilizing device, the range of the phase difference angle is narrowed more quickly by the opening / closing control of the phase adjuster by the control device. That is, the phase difference angle converges within a predetermined range faster.

Further, in the power system stabilizing device, the control device opens and closes the phase adjuster so that the bus voltage is decreased, and an operation for controlling the opening and closing of the phase adjuster so that the voltage of the bus is increased. The controlling operation may be repeated a predetermined number of times.
According to this power system stabilizing device, for example, the power system can be further swayed by raising and lowering the voltage of the bus for a predetermined number of times that the phase difference angle of the generator effectively converges within a predetermined range. It can be effectively and efficiently suppressed.

Further, in the power system stabilizing device, the control device opens and closes the phase adjuster so that the bus voltage is decreased, and an operation for controlling the opening and closing of the phase adjuster so that the voltage of the bus is increased. The controlling operation may be repeated until the phase difference angle is within a predetermined range.
According to the power system stabilizing device, the fluctuation of the power system can be more effectively and reliably suppressed.

In the power system stabilizing device, it is preferable that the control device prioritizes the switching control of the phase adjuster over the shutoff of the generator.
According to this power system stabilizing device, even when the upstream generator is accelerated due to a transmission line accident, for example, the acceleration of the generator is suppressed through the phase shifter opening / closing control. Therefore, the fluctuation of the electric power system is more effectively and reliably suppressed while the control amount of the electric power system is suppressed.

The power system stabilizing device further includes a storage device in which information indicating a relationship between the position of the transmission line accident and the phase shifter to be controlled for opening and closing is stored, and the control device includes the detection device. When the position of the power transmission line accident is detected, it is preferable that the phase shifter selected according to the information in the storage device is controlled to open and close.
According to this power system stabilizing device, for example, information indicating the relationship between the position of the transmission line accident and the phase adjuster that effectively converges the phase difference angle of the generator within a predetermined range in accordance therewith. Is stored in the storage device in advance, the fluctuation of the power system is more effectively and reliably suppressed.

In the power system stabilizing device, when the detection device detects the position of the power transmission line accident, the control device is adjacent to the power transmission line accident position based on the information in the storage device. It is preferable to control opening and closing of the phase adjuster.
If the phase adjuster adjacent to the position of the transmission line accident is controlled to open and close, the phase difference angle of the generator that changes with time due to the accident can converge more effectively within a predetermined range. According to the stabilization device, the fluctuation of the power system is more effectively and reliably suppressed.

In the power system stabilizing device, the phase adjuster is preferably a power capacitor or a shunt reactor.
When the power capacitor is turned on, the voltage of the bus increases, and when it is cut off, the voltage of the bus decreases. When the shunt reactor is cut off, the bus voltage drops, and when the shunt reactor is turned on, the bus voltage drops. By controlling these to open and close (turn-on and shut-off control), it is possible to effectively suppress fluctuations in the power system. In addition, for example, if power capacitors and shunt reactors that are normally used for purposes different from power system stabilization can be used for power system stabilization only in the event of an accident, the power can be reduced at that cost. System stabilization can be realized.

Further, the invention for solving the above problem is based on system information indicating a state of the power system when an accident of a transmission line disposed between the upstream side and the downstream side of the power system is detected. The generator is disposed on a bus such as a plurality of substations connected to the power transmission line so that the phase difference angle of the generator between the upstream side and the downstream side of the power system is within a predetermined range and This is a power system stabilization method for controlling opening and closing of a phase adjuster that controls supplied reactive power.
According to this power system stabilization method, fluctuations in the power system are suppressed while control amounts such as a power control amount and a negative control amount of the power system are suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the fluctuation of the electric power system can be suppressed, suppressing the control amount of an electric power system.

It is a block diagram which shows the structural example of the electric power system stabilization apparatus of this Embodiment. It is a systematic diagram which shows the structural example of the electric power system of this Embodiment. (A) is a graph showing a power phase difference curve when the voltage of the busbar is constant when the phase difference angle of the generator is expanded, and (b) is a graph of the busbar when the phase difference angle of the generator is expanded. It is a graph which shows a power phase difference angle curve in case a voltage rises. (A) is a graph showing a power phase difference angle curve when the voltage of the busbar is constant when the phase difference angle of the generator is reduced, and (b) is a graph of the busbar when the phase difference angle of the generator is reduced. It is a graph which shows a power phase difference angle curve in case a voltage falls. 3 is a flowchart for explaining an operation example of a master station and a computing device of the power system stabilizing device of FIG. 1. It is a diagram which shows an example of the time change of the phase difference angle of the generator of this Embodiment.

=== Power system stabilization device ===
With reference to FIG.1 and FIG.2, the structural example of the electric power system stabilization apparatus 1 of this Embodiment is demonstrated. FIG. 1 is a block diagram illustrating a configuration example of the power system stabilizing device 1, and FIG. 2 is a system diagram illustrating a configuration example of the power system of the present embodiment.

  As illustrated in FIG. 1, the power system stabilization device 1 includes a system information collection device (acquisition device) 20, an arithmetic device (control device) 11, a master station (control device) 10, and an accident detection device ( Detection devices) 12, 44, slave stations (control devices) 40, 30, circuit breakers 31, 41, power capacitors (SC: Shunt Capacitor) 42, shunt reactors (ShR: Shunt Reactor) , Phase adjuster) 43 and a transmission path 50.

  The system information collection device 20 is arranged in the power system, and operation information such as the generator terminal voltage Vs, the transmission line active power P, the transmission line reactive power Q, and the substation bus voltage Vr in the power system. Is an information processing device that acquires system information including all or a part of the power supply and circuit information of circuit breakers 31 and 41, a power capacitor 42, a shunt reactor 43, and the like in the same power system. In addition, the system | strain information collection apparatus 20 of this Embodiment is installed in the central power supply command station, for example.

  The arithmetic device 11 is an information processing device that calculates the transient stability of the power system based on the system information acquired by the system information collection device 20. Specifically, the arithmetic unit 11 determines the stability (that is, whether to step out) of the power system through transient stability calculation using a dynamic characteristic model of the power system for each accident. Selection of the phase adjusters 42 and 43 to be controlled for opening and closing, timing of the switching control, selection of the circuit breakers 31 and 41 to be controlled for opening (that is, the generator and load to be disconnected), and the like are performed. Here, the transient stability calculation of the present embodiment is performed on the premise that the opening / closing control of the phase adjusters 42, 43 is given priority over the opening control of the circuit breakers 31, 41. In other words, for example, the transient stability calculation of the power system is performed on the assumption that only the phase shifters 42 and 43 are controlled after the accident, and if this calculation result is insufficient as the stability of the power system. In this case, the transient stability calculation of the power system is performed again on the assumption that the open / close control of the circuit breakers 31 and 41 (that is, the electric control and the negative control) is performed together with the open / close control of the phase adjusters 42 and 43. In addition, the arithmetic unit 11 of this Embodiment is installed in the substation H (refer FIG. 2), for example, and is connected with the system | strain information collection apparatus 20 installed in the central power supply command station.

  The master station 10 is a control device that includes a CPU 101, a ROM 102, a RAM 103, a timer 104, and a storage device 105. For each accident, the CPU 101 sends a predetermined control signal (input) to the slave stations 40 and 30 corresponding to the phase adjusters 42 and 43 and the circuit breakers 31 and 41 selected by the arithmetic unit 11 based on the transient stability calculation. Command and shut-off command) are transmitted. The ROM 102 stores, for example, a program that determines the procedure of such processing. The RAM 103 stores, for example, various data used for such processing. The timer 104 measures the time for determining the timing for transmitting a predetermined control signal to the slave stations 40 and 30. The storage device 12 has, for example, the slave stations 40 and 30 respectively corresponding to the phase adjusters 42 and 43 and the circuit breakers 31 and 41 selected based on the transient stability calculation by the arithmetic device 11 for each accident position and aspect. Is stored in advance. The master station 10 according to the present embodiment is installed in, for example, a substation H, and is connected to the arithmetic device 11 and the accident detection device 12 installed in the substation H, and is also connected to the transmission path 50. .

  The accident detection devices 12 and 44, for example, based on the state of a plurality of protective relays (not shown) provided on the power transmission line, information on the accident position indicating the power transmission line where the accident has occurred, the accident point in the power transmission line, and the like. This is a detector that generates accident aspect information indicating the type and content of the accident and transmits this information to the master station 10 as a detection signal. As described above, the accident detection device 12 of the present embodiment is installed in, for example, the substation H, and the accident detection device 44 of the present embodiment is, for example, the substations D, E, F, G, I, J (see FIG. 2).

  The slave stations 40 and 30 turn on or off the power capacitor (SC) 42 and the shunt reactor (ShR) 43 with respect to the power system based on a predetermined control signal received from the master station 10, or And a control device for connecting or disconnecting the load. The slave station 40 of the present embodiment is installed in each of the substations D, E, F, G, I, and J, for example, and transmits the information on the accident position and the accident aspect from the accident detection device 44 to the master station 10. Also fulfills the function to do. Moreover, the slave station 30 of this Embodiment is each installed in power plant A, B, C, K (refer FIG. 2), for example.

  The circuit breakers 41 and 31 are devices that are controlled by the slave stations 40 and 30 to connect or disconnect the power system, the generator, and the load. The circuit breaker 41 according to the present embodiment is installed, for example, in each of the substations D, E, F, G, I, and J, and connects or disconnects the power system and a load (not shown). The circuit breakers 31 are installed at, for example, power plants A, B, C, and K, respectively, and connect or block the power system and the generator.

  The power capacitor (hereinafter abbreviated as “SC”) 42 is a phase adjuster that controls the reactive power (Q) of the bus by being turned on or off to the power system through the slave station 40. Specifically, the voltage of the bus (not shown) at the corresponding substation increases when the SC 42 is turned on, and the voltage of the bus at the corresponding substation decreases when the SC 42 is cut off. In addition, SC42 of this Embodiment is each installed in the substation D, E, F, G, I, and J, for example.

  A shunt reactor (hereinafter abbreviated as “ShR”) 43 is a phase adjuster that controls the reactive power (Q) of the bus by being turned on or off with respect to the power system through the slave station 40. Specifically, the voltage of the bus (not shown) at the corresponding substation increases due to the interruption of the ShR43, and the voltage of the bus at the corresponding substation decreases when the ShR43 is turned on. In addition, ShR43 of this Embodiment is each installed in the substation D, E, F, G, I, and J, for example.

  The transmission path 50 is a communication network such as a LAN (Local Area Network) that connects the master station 10 and the slave stations 40 and 30 so as to communicate with each other.

  In the electric power system illustrated in FIG. 2, power stations A, B, and C to substation D are connected by three transmission lines, and substation D is connected to substations E, F, G, and J. Is connected to the power plant K via a power transmission line, and is connected to the power plant K via a power transmission line via the substations H, I, and J. Moreover, the substation E and the substation H are connected by the power transmission line, and the substation F and the substation I are connected by the power transmission line. In other words, the power system of the present embodiment is configured so that a large tidal current is formed from the power plants A, B, C (upstream side) to the power plant K (downstream side), and the substations D, E, A loop path of a transmission line connecting H, a loop path of a transmission line connecting substations H, E, F, and I, and a loop path of a transmission line connecting substations I, F, G, and J Are connected to each other. With such a configuration, for example, even if an accident occurs in any one of a plurality of transmission lines passing through two substations, a route excluding the transmission line can be re-formed.

  In the power system illustrated in FIG. 2, it is assumed that loads (not shown) are appropriately connected to the buses (not shown) of the substations D, E, F, G, I, and J, respectively. Moreover, in the illustration of the same figure, each substation D, E, F, G, I, and J is illustrated as having one SC42 and one ShR43, but the present invention is not limited to this. Instead, each substation may be provided with, for example, two or more SC42, two or more ShR43, and the like.

  Therefore, hereinafter, the “phase adjusters 42, 43” include both one phase adjuster 42, 43 and a plurality of phase adjusters 42, 43. Unless otherwise stated, it includes both (1) different phase shifters 42 and 43 installed in different substations, and (2) different phase shifters 42 and 43 installed in the same substation.

  Further, hereinafter, in the case of “controlling the opening and closing of the phase adjusters 42 and 43 and then controlling the opening and closing of the phase adjusters 42 and 43”, these phase adjusters 42 and 43 are ( 1) different phase shifters 42, 43 installed in different substations, (2) different phase shifters 42, 43 installed in the same substation, and (3) the same phase shifters 42, 43. All inclusive.

=== Power system stabilization method ===
An operation example of the power system stabilizing device 1 having the above-described configuration will be described with reference to FIGS. 3 to 6. FIG. 3 (a) is a graph showing a power phase difference curve when the voltage of the bus is constant when the phase difference angle of the generator is expanded, and FIG. 3 (b) is a graph showing the phase difference angle of the generator. It is a graph which shows a power phase difference angle curve in case the voltage of a bus line rises when expanding. 4A is a graph showing a power phase difference curve when the voltage of the bus is constant when the phase difference angle of the generator is reduced, and FIG. 4B is a graph showing the phase difference angle of the generator being reduced. It is a graph which shows a power phase difference angle curve in case the voltage of a bus-line falls at the time. FIG. 5 is a flowchart for explaining an operation example of the master station 10 and the arithmetic unit 11 of the power system stabilizing device 1 of FIG. FIG. 6 is a diagram illustrating an example of a temporal change in the phase difference angle of the generator.

  First, a mechanism for narrowing the change range of the phase difference angle of the generator in the power system by opening / closing control of the phase adjusters (SC42 and ShR43) after the transmission line accident in the power system will be described.

<<< Voltage rise when phase difference angle is expanded >>>
As illustrated in FIG. 3 (a), the state of the power system before the accident (that is, the operating state of the generator) is the relationship between the phase difference angle of the generator and the output (active power) from the generator. Of the two points where the power phase difference angle curve “before accident” shown and the straight line indicating the input to the generator (mechanical input Pm) intersect, this is represented by an operating point a having a smaller phase difference angle. The power phase difference angle curves in FIGS. 3 and 4 are based on a model of a one-machine infinite bus system. For example, the relationship between the phase difference angle between the generator at power plant A and the generator at power plant K in FIG. 2 and the available power on the possible line from substation D to substation J in FIG. Suppose that it is approximately represented by the power phase difference curve of FIG. 3 and FIG. 4 based on the model of the machine infinite bus system. That is, the power phase difference angle curve, which will be described in detail with reference to FIGS. 3 and 4, from now on, generally represents the state of the power system of the present embodiment illustrated in FIG.

  When an accident occurs in the transmission line of the power system, the state of the power system is changed from the operating point a on the power phase difference angle curve “before the accident” to the operating point b on the power phase difference angle curve “at the time of accident”. The transition is made while maintaining δ0, and thereafter, the operating point b is moved from the operating point b to the operating point c along the “accident” power phase difference angle curve so that the phase difference angle increases from δ0 to δ1. Note that, as illustrated in FIG. 3A, the power phase difference angle curve “in the accident” extends to the side where the active power is smaller than the power phase difference angle curve “before the accident”.

  For example, when the cause of the transmission line accident is removed at the operation point c, the power system state is changed from the operation point c on the power phase difference angle curve “in the accident” to the operation point on the power phase difference angle curve “after the accident”. Transition is made to d while maintaining the phase difference angle δ1, and then the operation point d moves from the operating point d to the operating point e along the power phase difference curve “after the accident” so that the phase difference angle increases from δ1 to δ2. Here, the operating point e at which the phase difference angle turns from expansion to reduction is uniquely determined by the condition of the equal area described below. That is, the area SA corresponding to the acceleration energy from the operating point b to the operating point c between the straight line indicating the mechanical input Pm illustrated in FIG. It is equal to the area SB corresponding to the deceleration energy from the operating point d to the operating point e between the “after accident” power phase difference angle curve and the straight line indicating the mechanical input Pm illustrated in FIG. As illustrated in the figure, the power phase difference curve “after the accident” generally has a smaller effective power than the power phase angle curve “before the accident” and the power phase angle curve “on the accident”. It extends to the side where the active power is larger than.

  As illustrated in FIG. 3 (b), the voltage of the generator bus is in the process of moving from the operating point d to the operating point e along the power phase difference curve “after the accident”. A case where the value is raised will be described. As illustrated in the figure, the power phase difference curve after “voltage rise” when the generator bus voltage is raised is more active than the power phase difference curve after “accident”. Extends to the larger side.

  When the voltage of the generator bus is raised when the power system state is at the operating point d1 between the operating point d and the operating point e, the state of the power system is changed to the “after accident” power phase difference curve. Transition from the operating point d1 to the operating point d2 on the power phase difference angle curve “after voltage increase”, and then, from the operating point d2 along the power phase angle curve “after voltage increase” so that the phase difference angle increases. Move to point e1. Here, the operating point e1 at which the phase difference angle changes from enlargement to reduction is uniquely determined by the condition of the same area as described above. That is, the operation point d1 to the operation point d1 between the power phase difference angle curve “after the accident” and the power phase difference angle curve “after the voltage rise” illustrated in FIG. 3B and the straight line indicating the mechanical input Pm. , D2 and the area SB ′ corresponding to the deceleration energy up to the operating point e1 are equal to the area SA described above. That is, the area SB 'is equal to the area SB (= area SA) described above. The “after voltage rise” power phase difference angle curve that defines a part of the area SB ′ in FIG. 3B is more than the “after accident” power phase angle curve that defines the area SB in FIG. Since the active power extends to the larger side, the phase difference angle δ3 of the operating point e1 is the phase difference of the operating point e corresponding to the larger active power under the condition that the area SB ′ and the area SB are equal. It is located on the side smaller than the angle δ2.

  In FIG. 3B, the voltage of the bus is increased when the state of the power system enters the deceleration energy region. However, the present invention is not limited to this. The same result can be obtained by increasing the voltage of.

<<< Voltage drop when phase difference angle is reduced >>>
As illustrated in FIG. 4A, for example, when the operation point e1 on the power phase difference curve “after voltage rise” is changed from enlargement to reduction subsequent to FIG. 3B, the state of the power system ( That is, the generator operating state) moves from the operating point e1 to the operating point f along the power phase difference angle curve “after voltage increase” so that the phase difference angle is reduced from δ3 to δ6. Here, the operating point f at which the phase difference angle turns from reduction to enlargement is uniquely determined by the same area condition as described above. That is, the area SC corresponding to the deceleration energy and the acceleration energy corresponding to the intersection of the straight line indicating the mechanical input Pm illustrated in FIG. 4A and the power phase difference curve “after voltage increase” are equivalent to the acceleration energy. The areas SD to be processed are equal to each other.

  As illustrated in FIG. 4B, the state of the power system described above is in the process of moving from the operating point e1 to the operating point f along the power phase difference angle curve “before the voltage drop (after the voltage rise described above)”. The case where the voltage of the generator bus is lowered will be described. As illustrated in the figure, the power phase difference curve after “voltage drop” when the voltage of the generator bus is lowered is higher than the power phase difference curve “before voltage drop”. Extends to the smaller side.

  When the voltage of the generator bus is lowered when the state of the power system is the operating point e2 between the operating point e1 and the operating point f, the state of the power system is the power phase difference curve “before the voltage drop” From the operation point e2 to the operation point e3 on the power phase difference curve “after the voltage drop”, and then from the operation point e3 along the power phase angle curve “after the voltage drop” so that the phase difference angle decreases. Move to operating point f1. Here, the operating point f1 at which the phase difference angle shifts from reduction to enlargement is uniquely determined by the same area condition as described above. That is, the area SC ′ corresponding to the deceleration energy described above is equivalent to the extent that the power phase difference curve after “voltage drop” extends to the side where the active power is smaller than the power phase difference curve “before voltage drop”. Is smaller than the area SC described above. As a result, the phase difference angle δ5 at the operating point f1 becomes the phase difference angle δ6 at the operating point f by the amount that the area SD ′ (= area SC ′) corresponding to the acceleration energy is smaller than the area SD (= area SC) described above. Located on the larger side.

  In FIG. 4B, the voltage of the bus is lowered when the state of the power system is within the deceleration energy region, but the present invention is not limited to this. The same result can be obtained even if the voltage is decreased.

  From the above, when the phase difference angle of the generator increases after a power transmission line accident in the power system, if the voltage of the generator bus is increased by turning on SC42 or shutting off ShR43 to the power system, the phase difference The maximum value at which the angle changes from enlargement to reduction becomes smaller (δ2 in FIG. 3A becomes δ3 in FIG. 3B). Also, if the phase difference angle of the generator is reduced after a power transmission line accident in the power system, the phase difference angle can be reduced by lowering the generator bus voltage by shutting off SC42 or turning on the ShR43 to the power system. Increases from the reduction to the enlargement (δ6 in FIG. 4A becomes δ5 in FIG. 4B). That is, after the transmission line accident in the power system, the change range of the phase difference angle of the generator in the power system can be narrowed by opening / closing control of the phase adjusters (SC42 and ShR43).

<<< Processing procedure of master station and arithmetic unit >>>
As illustrated in FIG. 5, the master station 10 of the power system stabilizing device 1 determines whether or not an accident has been detected in a transmission line included in the power system (S100). Specifically, the master station 10 determines whether information on the accident position and information on the accident aspect have been received as detection signals from the accident detection devices 12 and 44 closest to the accident position on the power transmission line, for example.

  When it is determined that an accident has been detected (S100: YES), the master station 10 reads control information from the storage device 105 (S101). This control information includes, for example, a substation SC42 on / off command, a substation ShR43 on / off command, a power plant generator circuit breaker 31 shutdown command, and a substation load shutdown. This is information indicating a shut-off command or the like of the device 41. For SC42, if it is operated in step S103 or S104, which will be described later, a closing command is issued, but if it is operated in steps S109 and S112, which will be described later, not only a closing command but also a cutoff command can be issued. . Similarly, a shunt command is issued to ShR43 if it is operated in step S103 or S104 described later, but if it is operated in steps S109 and S112 described later, not only a shutoff command but also a closing command is issued. Can be issued.

  Specifically, the master station 10 reads control information related to the SC 42, ShR 43, circuit breakers 31, 41, and the like associated with the accident position and the accident aspect indicated by the detection signal described above from the storage device 105. This control information stored in the storage device 105 is a result obtained by the computation device 11 fetching the system information at regular intervals and executing the transient stability calculation. In this transient stability calculation, every time the system information is updated at a constant period, (1) the phase difference angle of the generator, which will be described later, is increased after the power system is stabilized only by opening / closing control of the phase adjusters 42 and 43. Alternatively, the calculation is executed under the condition that the phase difference angle is converged within a predetermined range by opening / closing control of the phase adjusters 42 and 43 according to the reduction (corresponding to step S103 and later described below). If the calculation result under these conditions does not sufficiently suppress the fluctuation of the electric power system, (2) the stability of the electric power system can be achieved by using both the open / close control of the phase adjusters 42 and 43 and the electric control and the negative control. Under the condition that the phase difference angle converges within a predetermined range by opening / closing control of the phase adjusters 42 and 43 according to the enlargement or reduction of the phase difference angle of the generator, which will be described later (corresponding to step S104 and later described below). The calculation is executed again. This means that the switching control of the phase adjuster is prioritized over the electric control and the negative control. In the present embodiment, the above-described calculation results, that is, the SC 42 that should be turned on to stabilize the power system in which an accident of a certain aspect has occurred at a certain accident position, the ShR 43 that should be shut off, and the open state should be made. Information indicating the circuit breakers 31 and 41 and the like are stored in the storage device 105 while being updated at regular intervals.

  When the control information read from the storage device 105 in step S101 described above indicates only the phase adjusters (that is, SC42 and ShR43) (S102: “SC / ShR only”), the master station 10 is selected. Then, the slave station 40 such as the SC 42 or the ShR 43 is caused to perform an operation for controlling the opening / closing to increase the voltage of the bus (S103).

  Further, when the control information read from the storage device 105 in the above-described step S101 indicates the phase adjuster (ie, SC42 and ShR43) and the circuit breakers 31, 41 (ie, electric control and negative control) ( S102: “SC / ShR + electric control / negative control”), the master station 10 performs an open / close control on the selected slave station 40 such as SC42 or ShR43 in order to increase the voltage of the bus. The operation for opening the slave stations 30 and 40 of the circuit breakers 31 and 41 is simultaneously performed (S104).

  Note that the above-described step S102 divides the on / off command read out at the above-described step S101 into cases for convenience of explanation, and does not represent a specific determination operation of the master station 10.

  Receiving the control signal from the master station 10, the arithmetic unit 11 causes the system information collecting apparatus 20 to capture system information (S107). In addition, this system | strain information is information which shows the tidal current of generators, such as the active power P of the power transmission line in the electric power system, the reactive power Q, and the electric current I as mentioned above. For example, the computing device 11 of the present embodiment associates information indicating these tidal currents with a predetermined storage unit (not shown) in association with an elapsed time (after the accident) measured by a predetermined timer (not shown). Assume that the time change of the phase difference angle of the generator is sequentially obtained from the time change of the tidal current stored in the storage unit.

  The master station 10 refers to the calculation result of the arithmetic device 11 based on the captured system information and determines whether or not the phase difference angle of the generator is reduced (S108). When it is determined that the phase difference angle of the generator is not reduced (S108: NO), the master station 10 causes the arithmetic unit 11 to execute the process of step S107 again.

  When it is determined that the phase difference angle of the generator is decreasing (S108: YES), the master station 10 determines whether to shut off a predetermined SC42 or input a predetermined ShR43 in the control information read in step S101 described above. Is transmitted to the corresponding slave station 40 (S109). This control information includes, for example, a shut-off command or a turn-on command to be transmitted to the SC 42 or ShR 43 suitable for converging the phase difference angle of the generator within a predetermined range for each accident position and aspect. Yes.

  Next, in response to the control signal from the master station 10, the arithmetic device 11 causes the system information collection device 20 to capture system information (S110). As described above, the arithmetic unit 11 obtains the time change of the phase difference angle of the generator from the time change of the tidal current after the accident.

  The master station 10 refers to the calculation result of the arithmetic device 11 based on the captured system information, and determines whether or not the phase difference angle of the generator is increased (S111). When it is determined that the phase difference angle of the generator has not increased (S111: NO), the master station 10 causes the arithmetic device 11 to execute the process of step S110 again.

  When it is determined that the phase difference angle of the generator is increasing (S111: YES), the master station 10 sends a predetermined ShR43 input command or a predetermined ShR43 cutoff command in the control information read in step S101 described above. Is transmitted to the corresponding slave station 40 (S112). This control information includes, for example, a shut-off command or a turn-on command to be transmitted to the SC 42 or ShR 43 suitable for converging the phase difference angle of the generator within a predetermined range for each accident position and aspect. Yes.

  In the present embodiment, the SC42 or ShR43 on / off command corresponding to the enlargement / reduction of the phase difference angle of the generator is generated by the master station 10 based on the calculation result of the arithmetic unit 11 using the system information. However, the present invention is not limited to this. For example, an arithmetic device may be provided for each of the slave stations 30 and 40 to provide a function for determining whether the phase difference angle is enlarged or reduced instead of the master station 10. Good. Thereby, for example, it is possible to save information transmission time and the like spent for transmitting the SC42 or ShR43 on / off command from the master station 10 to the corresponding slave stations 30 and 40. That is, it is possible to suppress a control delay related to turning on / off the SC 42 or the ShR 43.

  Further, in the present embodiment, when an accident occurs in the transmission line of the power system, the expansion / reduction of the phase difference angle of the generator is detected, and SC42 or ShR43 is turned on / off according to the detection result. It is not limited to this. For example, for each of various accident positions and situations that are assumed in the power system, the time when the SC 42 or the ShR 43 is optimally turned on and off (for example, when an accident occurs) for the arithmetic unit 11 to suppress the fluctuation of the power system by calculation in advance. The reference time may be 0 seconds) and the number of times may be obtained, and information on these times and times may be stored in advance in the storage device 105 for each accident position and aspect. When an accident occurs, information on a predetermined time and number of times corresponding to the accident is read from the storage device 105, referring to a timer 104 and a counter (not shown), and at the time determined before the accident By outputting the SC42 or ShR43 on / off command for the number of times determined in (b), the control delay related to the on / off of the SC42 or ShR43 can be suppressed as much as the time spent for calculation during the accident can be saved.

  Next, in response to the control signal from the master station 10, the computing device 11 causes the system information collection device 20 to capture system information (S113). The arithmetic unit 11 calculates the phase difference angle of the generator from the tidal current after the accident.

  The master station 10 refers to the calculation result of the arithmetic device 11 based on the acquired system information, and determines whether or not the phase difference angle of the generator is within a predetermined range (S114). When it is determined that the phase difference angle of the generator is not within the predetermined range (S114: NO), the master station 10 executes Step S107 described above again. On the other hand, when it is determined that the phase difference angle of the generator is within the predetermined range (S114: YES), the master station 10 ends the process. In step S114, instead of determining whether or not the phase difference angle of the generator is within a predetermined range, for example, it is determined whether or not the number of SC42 or ShR43 operations described above has reached a predetermined number. May be. In other words, the number of times SC42 or ShR43 is turned on / off (steps S109 and S112) is counted by the counter (not shown) described above, and it is determined whether or not the number counted by this counter has reached a predetermined number in step S114. May be. The information indicating the predetermined number of times is calculated in advance for each accident position and aspect by the arithmetic device 11 described above and stored in the storage device 105 before the accident.

  In FIG. 6, in the example of the solid line in which the phase difference angle of the generator oscillates sinusoidally with time (this embodiment), an accident occurs (this time is set to 0 seconds), and a predetermined time immediately after the accident is removed. SC42 (step S103 described above), for example, at a time immediately after the phase difference angle first changed from enlargement to reduction, a predetermined ShR43 is input (step S109 described above), and then, for example, the phase difference angle is first The phase difference angle converges within a predetermined range by cutting off the input ShR43 at the time immediately after the shift from reduction to enlargement (step S112 described above).

  As an example, when a route disconnection accident occurs in the transmission line between the adjacent substations D and E in FIG. 2, the other transmission line (the transmission line between the adjacent substations D and H) Since the tidal current is concentrated, the phase difference angle of the generators (upstream side) of the power plants A, B, and C with respect to the generator (downstream side) of the power plant K continues to expand, and the generator will step out.

  Even if only electric control and negative control are performed when the cause of the accident is removed immediately after the accident, the phase difference angle of the generator continues to expand without turning down in the example of the one-dot chain line in FIG. The generator will step out.

  If the cause of the accident is removed immediately after the accident, for example, if the SCs 42 of the substations D and E adjacent to the accident location are turned on, in the example of the dotted line in FIG. 6, the first wave step-out is avoided. However, in the example of the dotted line in the figure, the phase difference angle of the generator is reduced from enlargement to enlargement at the third time, for example, when the maximum value at the time of switching from enlargement to reduction at the second time is displaced in a larger direction. It diverges without turning to, and eventually the generator will step out.

  In the present embodiment illustrated in FIG. 6, ShR43 that was shut off during the accident at substations D and E adjacent to the accident location at the time immediately after the phase difference angle of the generator first changed from expansion to reduction. For example, by lowering the voltage of the buses of the substations D and E, based on the principle explained in FIG. 4B, the phase difference angle of the generator is first changed from reduction to enlargement. The minimum value of the phase difference angle is increased. Further, at the time immediately after the phase difference angle of the generator first changes from reduction to enlargement, the above-mentioned ShR43 is cut off, and the voltage of the buses of the substations D and E is increased, for example, as shown in FIG. Based on the principle explained in b), the maximum value of the phase difference angle at the time when the phase difference angle of the generator has changed from the second enlargement to the second reduction is made smaller. Thus, by reducing the maximum value of the phase difference angle of the generator and increasing the minimum value, the phase difference angle can be converged within a predetermined range.

  In the illustration of FIG. 6, after the opening / closing control of the phase adjusters 42, 43 immediately after the accident, the number of times of opening / closing control of the phase adjusters 42, 43 according to the expansion or reduction of the phase difference angle of the generator is the phase difference angle. There were only two operations: turning on ShR43 for lowering the bus voltage when reducing the voltage and shutting off ShR43 for raising the bus voltage when the phase difference angle was increased. This is the case when it is determined in step S114 that the phase difference angle of the generator has converged within a predetermined range immediately after the processing of steps S107 to S113 in FIG. 5 is executed for the first time after the accident (S114: YES). Equivalent to. However, it is not limited to the processing procedure of FIG. For example, the number of times of opening / closing control of the phase adjusters 42 and 43 (predetermined number of times) is determined in advance based on the calculation result of the arithmetic unit 11 without performing the processing of steps S113 and S114. It may be included in the control information. Further, in steps S107 to S109 (A) and steps S110 to S112 (B) in FIG. 5, the phase difference angle of the generator is first reduced (corresponding to A) and then expanded (corresponding to B). However, the present invention is not limited to this. For example, opening / closing control of the phase adjusters 42 and 43 may be performed in accordance with the determination result while determining whether the phase difference angle of the generator is enlarged or reduced.

  Moreover, in the illustration of FIG. 6, although the phase adjusters 42 and 43 of the object of switching control are the phase adjusters adjacent to the accident position of the transmission line, they are not limited to this. For example, even if the phase shifters 42 and 43 are far from the accident location, the power system is suitable for raising and lowering the voltage of the corresponding bus effectively. A phase adjuster that is not adjacent to the accident position of the electric wire may be controlled to open and close.

  Furthermore, in the illustration of FIG. 6, when the ShR 43 is shut off, the same ShR 43 as the ShR 43 that is input immediately before is shut off, but the present invention is not limited to this. As defined above, the ShR43 introduced in the first time and the ShR43 interrupted in the second time may be different phase shifters in different substations or different in the same substation. A phase adjuster may be used.

  The power system stabilizing device 1 of the present embodiment has at least a loop between the upstream side (for example, the generators of the power plants A, B, and C) and the downstream side (for example, the power generator of the power plant K). A detection device (for example, the accident detection device 12, 44) that detects an accident of a power transmission line arranged to form a power supply, and an acquisition device (for example, the system information collection device 20) that acquires system information indicating the state of the power system And a phase adjuster (for example, for controlling reactive power supplied to the bus, which is disposed on the bus of a plurality of substations (eg, substations D, E, F, G, I, J) connected to the transmission line) SC42, ShR43, etc.) and the detection device detects a power transmission line accident, the phase difference angle of the generator between the upstream side and the downstream side of the power system is within a predetermined range based on the system information acquired by the acquisition device Control to control opening and closing of the phase adjusters 42 and 43 so as to be within Location (e.g., computing device 11, the master station 10, slave stations 40) and it is sufficient that comprises a.

  According to the power system stabilizing device 1, when a power transmission line accident occurs, the voltage of the corresponding bus is raised or lowered through opening / closing control of the phase adjusters 42 and 43 corresponding to the state of the power system indicated by the system information. The phase difference angle of the generator between the upstream side and the downstream side of the power system is converged within a predetermined range to suppress the fluctuation of the power system, and thus not only the first wave step-out but also the subsequent step-out. Can be prevented. That is, the fluctuation of the electric power system is suppressed while the control quantities such as the electric control amount and the negative control amount of the electric power system are suppressed.

Further, in the power system stabilizing device 1 described above, the system information is information indicating the phase difference angle or tidal current of the generator between the upstream side and the downstream side of the power system.
According to the power system stabilizing device 1, for example, the voltage of the bus can be raised or lowered according to the phase difference angle of the generator representing the fluctuation of the power system or the time change of the tidal current. It is possible to effectively suppress the fluctuation of the electric power system while suppressing the control amount such as the control amount.

Further, in the power system stabilizing device 1 described above, the control device controls opening and closing of the phase adjusters 42 and 43 so that the bus voltage increases when the phase difference angle increases based on the system information, and the phase difference angle. Is reduced, the phase adjusters 42 and 43 are controlled to open and close so that the bus voltage drops.
If the bus voltage increases when the phase difference angle of the generator increases, the maximum value at which this phase difference angle turns from expansion to reduction decreases (FIG. 3 (b)), and the bus line decreases when the phase difference angle of the generator decreases. When this voltage is lowered, the minimum value at which this phase difference angle shifts from reduction to enlargement increases (FIG. 4B). Therefore, according to the power system stabilizing device 1, the range of the phase difference angle is narrowed more quickly by the opening / closing control of the phase adjusters 42 and 43 described above by the control device. That is, the phase difference angle converges within a predetermined range faster.

Further, in the power system stabilizing device 1 described above, the control device operates to open / close the phase adjusters 42 and 43 so that the bus voltage increases, and to adjust the phase adjusters 42 and 43 so that the bus voltage decreases. The operation of controlling the opening / closing of 43 is repeated a predetermined number of times (that is, the two times illustrated in FIG. 6 may be a predetermined number of times as described above).
According to the power system stabilizing device 1, for example, the power system is shaken by increasing or decreasing the voltage of the bus a predetermined number of times so that the phase difference angle of the generator effectively converges within a predetermined range. More effectively and efficiently can be suppressed.

Further, in the power system stabilizing device 1 described above, the control device operates to open / close the phase adjusters 42 and 43 so that the bus voltage increases, and to adjust the phase adjusters 42 and 43 so that the bus voltage decreases. The operation of controlling opening / closing 43 is repeated until the phase difference angle falls within a predetermined range (see, for example, steps S114: NO and S107 in FIG. 5).
According to the power system stabilizing device 1, it is possible to more effectively and reliably suppress the fluctuation of the power system.

Moreover, in the electric power system stabilization apparatus 1 mentioned above, the control apparatus gives priority to the opening / closing control of the phase adjusters 42 and 43 over the interruption of the generator.
According to the power system stabilizing device 1, even if the upstream generator is accelerated due to a transmission line accident, for example, the generator acceleration is suppressed through the open / close control of the phase adjusters 42 and 43. Therefore, the fluctuation of the electric power system is more effectively and reliably suppressed while the control amount such as the electric control amount and the negative control amount of the electric power system is suppressed.

The power system stabilizing device 1 described above further includes a storage device 105 in which information indicating the relationship between the position of the transmission line accident and the phase adjusters 42 and 43 to be opened and closed is stored in advance. When the detection device detects the position of the power transmission line accident, the phase adjusters 42 and 43 selected according to the information in the storage device 105 are controlled to open and close.
According to the power system stabilizing device 1, for example, with the position of the transmission line accident and the phase adjusters 42 and 43 that effectively converge the phase difference angle of the generator within a predetermined range in accordance with this By storing information indicating the relationship in the storage device 105 in advance, the fluctuation of the power system is more effectively and reliably suppressed.

Further, in the power system stabilization device 1 described above, when the detection device detects the position of the power transmission line accident, the control device adjusts adjacent to the power transmission line accident position based on the information in the storage device 105. The phasers 42 and 43 are controlled to open and close.
If the phase adjusters 42 and 43 adjacent to the position of the transmission line accident are controlled to open and close, the phase difference angle of the generator that changes with time due to the accident can converge more effectively within a predetermined range. According to the power system stabilizing device 1, the fluctuation of the power system is further effectively and reliably suppressed.

In the power system stabilizing device 1 described above, the phase adjuster is the power capacitor 42 or the shunt reactor 43.
When the power capacitor 42 is turned on, the bus voltage increases, and when the power capacitor 42 is cut off, the bus voltage decreases. When the shunt reactor 43 is cut off, the bus voltage drops, and when it is turned on, the bus voltage drops. By controlling these to open and close (turn-on and shut-off control), it is possible to effectively suppress fluctuations in the power system. In addition, for example, if the power capacitor 42 and the shunt reactor 43 that are normally used for purposes different from the stabilization of the power system can be used for stabilizing the power system only at the time of an accident, the cost is reduced accordingly. Can stabilize the power system.

In addition, the power system stabilization method of the present embodiment is system information indicating the state of the power system at least when an accident of a transmission line disposed between the upstream side and the downstream side of the power system is detected. Is arranged on the buses of a plurality of substations connected to the transmission line so that the phase difference angle of the generator between the upstream side and the downstream side of the power system is within a predetermined range and The phase adjusters 42 and 43 that control the reactive power supplied may be controlled to open and close.
According to this power system stabilization method, fluctuations in the power system are suppressed while control amounts such as a power control amount and a negative control amount of the power system are suppressed.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 1 Power system stabilization apparatus 10 Master station 11 Arithmetic apparatus 12, 44 Accident detection apparatus 20 System information collection apparatus 30, 40 Slave station 31, 41 Circuit breaker 42 Power capacitor (SC), phase adjuster 43 Shunt reactor (ShR) ), Phase adjuster 101 CPU
102 ROM
103 RAM
104 timer 105 storage device

Claims (9)

A detection device for detecting an accident in a transmission line disposed between the upstream side and the downstream side of the power system;
An acquisition device that acquires system information indicating the state of the power system;
A phase adjuster that is disposed on a bus such as a plurality of substations connected to the power transmission line and controls reactive power supplied to the bus,
When the detection device detects an accident in the transmission line, based on the system information acquired by the acquisition device, the phase difference angle of the generator between the upstream side and the downstream side of the power system is within a predetermined range. And a control device for controlling the opening and closing of the phase adjuster ,
The control device controls opening and closing of the phase adjuster so that the voltage of the bus increases when the phase difference angle increases based on the system information, and when the phase difference angle decreases, the voltage of the bus The power system stabilizing device is characterized in that the phase adjuster is controlled to open and close so as to descend . The system information is information for performing transient stability calculation before the transmission line accident is detected, and between the upstream side and the downstream side of the power system when the transmission line accident is detected. The power system stabilizing device according to claim 1, wherein the information is one of information for determining whether the phase difference angle of the generator is enlarged or reduced, and information indicating a power flow. The control device repeats a predetermined number of times an operation of controlling the opening / closing of the phase shifter so that the voltage of the bus bar increases and an operation of controlling the opening / closing of the phase adjuster so that the voltage of the bus line decreases. The power system stabilizing device according to claim 1 or 2 , wherein The control device has an operation for controlling the opening and closing of the phase adjuster so that the voltage of the bus bar increases, and an operation for controlling the opening and closing of the phase adjuster so that the voltage of the bus line decreases. It repeats until it becomes in the predetermined range. The electric power system stabilization apparatus of Claim 3 characterized by the above-mentioned. The power system stabilization device according to any one of claims 1 to 4 , wherein the control device gives priority to the switching control of the phase adjuster over the shut-off of the generator. A storage device in which information indicating the relationship between the position of the power transmission line accident and the phase shifter to be controlled for opening and closing is stored;
The control device controls opening and closing of the phase shifter selected according to information in the storage device when the detection device detects a position of an accident on the power transmission line. 5. The power system stabilizing device according to any one of 5 above. When the detection device detects the position of the power transmission line accident, the control device controls opening and closing of the phase shifter adjacent to the power transmission line accident position based on information in the storage device. The power system stabilization apparatus according to claim 6 . The power phase stabilizer according to any one of claims 1 to 7 , wherein the phase adjuster is a power capacitor or a shunt reactor. When an accident is detected in the transmission line arranged between the upstream side and the downstream side of the power system, based on the system information indicating the state of the power system, the upstream side and the downstream side of the power system When the phase difference angle is increased so that the phase difference angle of the generator in the range is within a predetermined range, the voltage of the buses such as a plurality of substations connected to the power transmission line is increased so that the voltage is increased. And controlling opening / closing of a phase shifter that controls reactive power supplied to the bus, and controlling the opening / closing of the phase shifter so that the voltage of the bus decreases when the phase difference angle decreases. Power system stabilization method.

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